Struct defined by macros get revised needlessly

[cstjean]

Consider:

@kwdef struct Blah
    x = 4
end

Changing 4 to 5, used to work fine and be near-instantaneous, but now it triggers structure revision, which is obviously a lot slower when many packages are loaded.

I found it via QuickTypes.jl's @qfunctor.

[cstjean]

Ah, I see that this was identified as part of #988. I'll close as duplicate...

[lassepe]

I think it makes sense to have an explicit issue for this. I would expect #988 to get closed as soon as revisions fall below 1s again (even if there are needles revisions for @kwdef and friends)